function s1_goto_dir(){
cd "$1"
}

function s2_touch_empty_file_with_given_name(){
touch "$1"
}

function s3_make_directories(){
mkdir -p projects/{git,backup}
}

function s4_create_6_file(){
touch projects/linux{1,2}_{centors,redhat,c_programming}
}

function s5_make_directories_in_git(){
mkdir -p projects/git/linux{1,2}
}

function s6_move_file_to_dir_1_or_2(){
mv./projects/linux1_*projects/git/linux1 && mv./projects/linux2_*projects/git/linux2
}

function s7_create_package_and_compress(){
tar -czvf./projects/backup/git.tar.gz projects/git
}
function s8_delete_dir_git(){
rm -rf./projects/git
}

function s9_recover_from_git_tar_gz_backup(){
tar -zxvf./projects/backup/git.tar.gz projects/
}

function s10_create_package_and_compress(){
tar _jcvf./projects/backup/git.tar.gz projects/git
}

function s11_find_and_sort_alphabetically_all_created_files_and_dir(){
find./projects |sort
}

function s12_get_next_15_minutes_boundary(){
date -d "@$(($(date+%s)-$(date+%s)%900+900))"+ "%Y-%m-%d_%H:%M:%S"
}

